线路绝缘子发生覆冰闪络故障，对线路安全运行造成威胁。
The ice flashover accident of transmission line insulator is harmful for transmission line safe operation.
线路绝缘子发生覆冰闪络故障，对线路安全运行造成威胁。
The ice flashover accident of transmission line insulator is harmful for transmission line safe operation. The cause of insulator ice flashover is the ice bridge.
线路绝缘子发生覆冰闪络故障，对线路安全运行造成了威胁。
The menace of transmission line safe operation is the ice flashover accident of transmission line insulator.
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